455 Compression Calculator

Simply fill in the form below to calculate your compression ratio.

Bore (diameter)

Stroke

Cylinder Head Volume

Effective Dome Volume(-) dome, (+) dish

Deck Clearance

Compressed Gasket Thickness.040 is standard thickness

Number of Cylinders

455 Block — Displacement Reference

Over	Bore	4.21" stroke	4.25" stroke	4.50" stroke
Stock	4.151	456	460	487
+.030	4.181	462	467	494
+.035	4.186	464	468	495
+.040	4.191	465	469	497
+.060	4.211	469	474	501
+.065	4.216	470	475	503